Abstract The effect of the deformation temperature (293 and 77 K) by high-pressure torsion (HPT) on the atomic structure of melt-quenched amorphous Fe83 − xNiхB17 alloys (х = 25, 29, 33) and their crystallization thermal effect upon continuous heating have been analyzed by method of Extended X-Ray Absorption Fine Structure (EXAFS) in synchrotron radiation, transmission electron microscopy, and X-ray diffraction analysis. HPT at 293 K decreases the crystallization thermal effect, whereas HPT at 77 K increases it regardless of the alloy composition. The observed effect is caused by the reversibility of the structural transformations in the alloys upon variation in the deformation temperature. According to the results of the structure examination, HPT at 293 K leads to the formation of more ordered state (partially crystallized) of the initial amorphous alloys. On the contrary, HPT at 77 K stimulates the formation of more disordered amorphous structure (by destruction of short-range order and an increase in the average values of the coordination numbers around the iron atoms in the first coordination sphere).

中文翻译：

---

不同温度高压扭转对非晶Fe-Ni-B合金局部原子结构的影响

摘要 高压扭转 (HPT) 变形温度 (293 和 77 K) 对熔融淬火非晶 Fe83 − xNiхB17 合金 (х = 25, 29, 33) 原子结构的影响及其结晶热效应已通过同步辐射中的扩展 X 射线吸收精细结构 (EXAFS)、透射电子显微镜和 X 射线衍射分析方法对加热进行了分析。293 K 的 HPT 会降低结晶热效应，而 77 K 的 HPT 会增加结晶热效应，而不管合金成分如何。观察到的效果是由变形温度变化时合金中结构转变的可逆性引起的。根据结构检测结果，293 K 下的 HPT 导致初始非晶合金形成更有序的状态（部分结晶）。相反，77 K 的 HPT 刺激更无序的无定形结构的形成（通过破坏短程有序和增加第一配位球中铁原子周围配位数的平均值）。